Biochar as a sustainable electrode material for electricity production in microbial fuel cells

Bioresour Technol. 2014 Apr:157:114-9. doi: 10.1016/j.biortech.2014.01.058. Epub 2014 Jan 24.

Abstract

Wood-based biochars were used as microbial fuel cell electrodes to significantly reduce cost and carbon footprint. The biochar was made using forestry residue (BCc) and compressed milling residue (BCp). Side-by-side comparison show the specific area of BCp (469.9m(2)g(-1)) and BCc (428.6cm(2)g(-1)) is lower than granular activated carbon (GAC) (1247.8m(2)g(-1)) but higher than graphite granule (GG) (0.44m(2)g(-1)). Both biochars showed power outputs of 532±18mWm(-2) (BCp) and 457±20mWm(-2) (BCc), comparable with GAC (674±10mWm(-2)) and GG (566±5mWm(-2)). However, lower material expenses made their power output cost 17-35US$W(-1), 90% cheaper than GAC (402US$W(-1)) or GG (392US$W(-1)). Biochar from waste also reduced the energy and carbon footprint associated with electrode manufacturing and the disposal of which could have additional agronomic benefits.

Keywords: Biochar; Bioelectrochemical; Electricity; Electrode; Microbial fuel cell.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Batch Cell Culture Techniques
  • Bioelectric Energy Sources*
  • Bioreactors
  • Charcoal / chemistry*
  • Electric Impedance
  • Electricity*
  • Electrochemical Techniques
  • Electrodes
  • Porosity

Substances

  • biochar
  • Charcoal